In-line, titanium dioxide-catalysed, ultraviolet mineralization of toxic aromatic compounds in the waste stream from a flow injection-based resorcinol analyser
- 1 January 1995
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in The Analyst
- Vol. 120 (2) , 231-235
- https://doi.org/10.1039/an9952000231
Abstract
A clean method was developed for the spectrophotometric determination of resorcinol. The method, based on the reaction between resorcinol and p-aminophenol (PAP), carried out in a flow system, involves an additional detoxification step based on the in-line TiO2-catalysed photodegradation of the indophenol dye formed and the remaining unreacted PAP. For this, after the measurement step the waste stream is merged with a TiO2 slurry (0.5 g l–1 in 0.22 mol l–1 HCl) and then passed through a UV photochemical reactor consisting of a PTFE tube (6 m × 0.8 mm i.d.) rolled on a UV lamp with a maximum irradiation wavelength of 254 nm. Under these conditions, the waste can be completely detoxified thus, providing a non-polluting method of analysis.Keywords
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